Abstract: The characteristics of relationship between the service subjects of national fitness in China are embodied in the following: On the basis of thinking, the people-centered thinking guides the action of the service subject; on the practice mode, it pursues the healthy operation of the government-led and socially-regulated national fitness system; on the development goal, it takes the synergy of economic and social benefits as the value of the purpose. The current national fitness service subject relationship exists “interests are differentiated, coordination is constrained, knowledge is compartmentalized” and other issues. Based on this, a collaborative innovation mechanism for Chinese-style modernism national fitness services is proposed. It refers to a national fitness service model that is constantly innovated with the vision of contributing to the wisdom of Chinese sports and forming an independent knowledge system for national fitness in China, guided by the theory of modern Chinese development and the spirit of the era of the people-centered thinking and the concept of great health, in order to achieve the fundamental goal of the comprehensive development of human beings and the advancement of Chinese-style modern development, with the guidance of the theory of modern Chinese development. The practical strategies are: innovation of the main body synergy concept highlights the subjectivity of the people and clarifies the rights and responsibilities of the service subject; technological innovation of the main body synergy is guided by value rationality, constructing a smart fitness service matrix; innovation of the collaborative model of multiple subjects by taking the theory of new-quality productive forces as the guidance and innovating the collaborative service model of multiple subjects; talent guarantee of the main body synergy is supported by high-end think tanks, promoting the cultivation of compound talents through industry, academia, and research collaboration.